Possible Clues:

• Hidden geeky side
• The part of you that likes geeking out
• True geeky self (... this one's first 2)
• Hidden intellectual side
• What you might embrace during a "Doctor Who" marathon
• Geeky side
• The secret geeky part of you ... or a hint to 17-, 23-, 32-, 42- and 49-Across